Memory and cpu stopping

index.js

/**
 * Created by prmadi on 8/20/2015.
 */
 
 var http = require('http');
 var port = process.env.PORT || '3000';
 
 // Memory Leak
 function LeakingClass() {
 }
 var leaks = [];
 setInterval(function() {
 for (var i = 0; i < 100; i++) {
 leaks.push(new LeakingClass);
 }
 console.error('Leaks: %d', leaks.length);
 }, 1000);
 
 http.createServer(function (req, res) {
 
 // CPU intensive work
 var fibonacci = function(n){
 if(n < 1){return 0;}
 else if(n == 1 || n == 2){return 1;}
 else if(n > 2){return fibonacci(n - 1) + fibonacci(n-2);}
 };
 fibonacci(40);
 
 res.writeHead(200, {'Content-Type': 'text/plain'});
 res.end('Hello World\n'+ fibonaccif(40));
 }).listen(port, '127.0.0.1');